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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a2abf0faa40373c4c4d32dcda834783af3b4787311f910c3d96e50b594c4038c' 
  AND token = 'vBOCvf8kMvrQHIdybk1va4CcYOWvcS67AlioWNd9HKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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