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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fcd73b557056629ff9f62e9520ab5db308cb8995c0f181df5277d6f6b330370f' 
  AND token = 'lu9dAkTY2t4adaGZ3Bt5QdOoG1xkFUNpaOVowlwE7Bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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