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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b7a1ddfbef2d8eee596820730a64487542c0e140f72b87fa54131ede87497614' 
  AND token = 'W+h2oPhv8ZZ3hkwq62DODsnhiC95p4nXmcr5J8E5FQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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