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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'd2b1c6188ee9ab950ccceb53a874aad1813138fa6a5eb3c5cf1d4c5f41d86e18' 
  AND token = 'VdAVVkPAJWUWFgadDdmNrSZY8vOdsnzR3EFUu6/iybw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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