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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'f3a858694ca3f3988d4b12e7be63ace51cfb0a22e705453115f54689bbd7c18e' 
  AND token = 's3o0RmgYsjSvnc53I1idYyvk3VWoJv/T4jq5xdyWYc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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