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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e2c1781f4ee54d654e49eaf27ae695b971b8368b8b09a68de5d9c82f5c0a574d' 
  AND token = 'eYPPC78X0Mat5jjFGFUm32UnmnMg6w0bD4RNneVzVw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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