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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5dc0101adfb28e996978b5217095ae4085c8250f69e9fd6303cd40aacc362b21' 
  AND token = '+DdfisxxfDv+H2yGMFzb6Oj3vQUHQcAGlNLtCm+KNNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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