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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '27f4f3a5714860110687ff26ca2d2bea473e45327febdbd5cd1410e4f0e81adb' 
  AND token = 'dSW9hCq8AkWiBBUtmvH2iOH2gb1LQL8TD0OoUhDw2Bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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