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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '90fb13b93ce74d787981ef7b1ea957aa90c169439713934bed8761291db496b4' 
  AND token = 'rM/RDbHS2owRFzagOPptJqQaxB+DAFDQo0f8dBXyyU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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