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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7127ca57333e40e9f0a99caf1bc82055f2b7de5e878d9eb271e8d4e4c5c0fbb7' 
  AND token = 'r+9RewukMrqv8CEXqqLhC0bkgAh+CNrKwj9mykjnxQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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