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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ca3e60ca94a122cce2813dfcec08e73e3d1725e061e78cccb6dbe48fac6fc74c' 
  AND token = 'REXiubiKMCL7o/e9ISjMHFJTi/UyM1qSan/1hffKBLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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