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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '01c8c8a3d23a5ffcfe84aba045466fe0d887b26ebe2f040678bbb0871ac0d0c8' 
  AND token = '0efpLLh6tTOXYO2WLQAvQnLkx5XVyNzwoK10cuI8vxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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