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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd02feda73859d70924b8f8effc1eab94f665d89712357db072d5ab2a52861cee' 
  AND token = 'ErpYobIwzX4BP6hN3u6Xj7ze24wzEeee2SU2ODw5wCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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