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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7f8a898eb031b26cc37c9f15c7e2a4a6148cbc591a1b79a4dee7ffa35086f3fc' 
  AND token = 'y4pAcub5r0NPV3JbV5Z/Uo8aMNHO8d27vrTxvxNYZKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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