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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '82af1cbc5d7994306b8af4bef1257bb9778f54ec4ba4d71ee70986c1e685cca1' 
  AND token = 'd+Gy6uMLUEf9feK6YZ1oZsLaabAo8PQrYj1YT/14FjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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