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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '6632f72af8f5979070de2d730edafbfd9accbf30613878b8a4055be120387ad9' 
  AND token = 'fQdXco5am11G4BSa5GrJV8oi5f9WkMpMJu3EsiL1nok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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