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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c5b754d3e87c97a2f9a9d6ab45f8bca9071aa142d5af47c045252436467dc73f' 
  AND token = '+9b7sUTTu+Vf7DIraIAYF2SANinz1JGquEc63Z2NohE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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