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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '73fa34302670b3611fdbfaed08d90cb3c2f41c7b9bca450c17500d14f3fcf82a' 
  AND token = '6lRqIrJ70poDEpfY9QD6VdPVWYI+fCPwNVN1TI2ugzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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