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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9e97ac3194fb0aabc9b0ea9b3a38cbd04846c8c5b25b2e8a327ca2cbcfac8497' 
  AND token = 'S4eQJbITpr/1N0C4nx8bQUZpA9pMnZ54pS3QZN+DN0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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