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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8fd8453e75cf18fa0f71e80268bd29950c0a5161fa9f631d39623b0d537009a7' 
  AND token = 'QHXTEXZyt8UTNUzXJ1aZcVXdeZVPt88Mp3Mc5KB4RfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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