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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4c02418381012a41b15bcd3febfa749cf7b282b0e6c1535a958cc5b7f670b71f' 
  AND token = '/38RpUXbl1wpu7bsHQZHqZ1v2NrkiNM4eaz257htP9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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