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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a06d754cb2c2d31a54919a50a95c4e41840aa6cf0a39cd74364012e015a5b998' 
  AND token = '1Q3AvSrbE2JasoDue7cm73g9pIypRdtrq6Wdivof3gA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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