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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9755ea6097f4041a9c7664449b40a819990584a226876b441f66ffa03d1f00a6' 
  AND token = 'Z9lDoGXb5cymykcdtj+bnnrFxAvTiIILXzezJmXXlCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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