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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9df8ca14a8cf9f391990197b3d28323a5cbf8a6a5aea2607ea32a870c0ca15b9' 
  AND token = '3tKgSQDmBfQc3JiO/L126uvOI2OaPRGypfW5rRc9tyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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