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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a0702c4b856cc6a1b9b887464c7f597736ac669d06a3a3abfebc7afe396ca3ba' 
  AND token = 'M/BwP5WwfcXt7mhb6xS/7YUteQFmfGjFhnd8WyUCRX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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