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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e93d8511099cf95a72d1be05554c11fcce33dff9aaf44df5c14831626beac54a' 
  AND token = 'MPOHEv1p9VE8Z2Dbc1q9bcwuQnVm4SXfQYhS6HmASJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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