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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '152af8fe93d47830ece26937e2a08cd31a7c94d6b4fb95fbc87b1280290f3dab' 
  AND token = 'yfua7zu7NVhRd4nBMPkIWDV0OJd49X4s8iqSdNBE3NE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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