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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'ef18ec91fc08c342c5e450f42c18b799b56db9524bc39b346467dc3022dcec70' 
  AND token = '/dbnW19cwOFLyih9h8m+9hO6rQlp3iMInxkvrFCQi9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}