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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3ac014c8aacdaba0e6871e39d595edc0dcc3c15ca4662e1245fe5ec4bfde8b17' 
  AND token = 'kE2D040r21Ad7hnpaKOwjjjfAl4btlN2WKPzqS25NlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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