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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7140e4b5f699f7b3d3604f4f49df619db0dc8c4e5d7adc312e25f0a4a5400575' 
  AND token = 'RiFQys+vzIWjtERH1Z/Slw6M9eWfjZ7fV1kkPcIBCtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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