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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '99d26e72a51a7c2d15f828768b89e2e2a84c5ca0964f3fdebb2fd613c71a8759' 
  AND token = '642834x7vfb0KxzscVbIM45lsGWfKuEHUK35QOkEJfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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