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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '9ea31422ac8a7fc961144684d9513b6ed228185b2df2ced33a236481f6f0ce52' 
  AND token = 'uOM+LDUkhHwdbJ4quODeQyRSLTNtMWRdP1CQRAFvy10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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