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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '477f2867cf32ee4e90b7e0963a90cb884558fdb5e182533d291c5fe1b5e6eefb' 
  AND token = 'w4flCu5FS928xhJ9jBiQmbWqoEw6kRLdsWi/LTeqH2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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