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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cdfc1c4446f8614ac625734e989ceb23081a5cfbef45447a8969d618b97ca951' 
  AND token = 'H0apD87YEaWAB14F5eTpAbGI3o/cXaOqHXXjAN3BV30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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