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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e32f52646542262fd00edc20e25fc72c6c7a4998a3c0b548346671c5ab245247' 
  AND token = 'SCjZ2AS0fI4rQWcMyTmtHIocXa3Xs9nkuflB1lvvujM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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