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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '83599789b9f35d4f21dbc8ad3a5b4681dd39af6fe93dff985abeed92e01af8dc' 
  AND token = 'iQqe6fa1Ax5WBMadJm9a/Y3OAF/Tw33AkN5WTsXAAIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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