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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b42202c937d9fc81901d777262a4e7e4b9bb08ff405c5592f769f273521016e8' 
  AND token = '966vHDjG6mU25hlLGGigB0b0EkUnF1pIvydEfoTNckc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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