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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '1bc4e45b6c9436649983fe07b29e5f8c44f38de3eb3c969474c3cf84c2de4132' 
  AND token = 'AEtMFmzpR+REx86iu3+YwrDCQLIKvYvPQwEH9AFzKm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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