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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c6cf3dcb75d9c97ea2e609237682f2dab3d33ca66481ed7630c2bd3441e0218a' 
  AND token = '0pRFQj9UOe5vhWlDsY9bm0zAHt6SbzGXUdpzjvckKuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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