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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4a7869dfa5d025eaca61197af50a3e1efcdae642d5da0f4ade294fccb5c1754a' 
  AND token = 'BBdMVzBjK0RH4w60hEf1hzXwhwC0UBecldawefglWaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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