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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '076b7d9cdf3122035caf5686a091c09e4c1d7d1768f2a515447891bc39f58f9c' 
  AND token = 'na7iLl6QloaNXmWgXy5DFzPBFN3x67MT5WMTzuzKi6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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