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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'dd8a7830e4aca0e6cc61fa0f7b4463bf2f0093ae64c3ca7b9f3ad25501e30669' 
  AND token = '7T9EAwbtj2VThyrGKuGSTQT92AET+fThuF5g9LX/rDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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