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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c4e415adc1328ef0715059354f2a81cc870757205d5224732313d8bd38562167' 
  AND token = 'Qxnu48Fcywh2pGsm7dkm595PR6syJQmCsA/I6inL77E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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