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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9c8fdf8077f14cac7f6bae8f50e398e870451d05632d77aa9fb4244d56b8ee0a' 
  AND token = '5MbLHCZYeL+KeadK/4jLs/9fBlQfgcm/vCOeu9uaok4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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