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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ecee0521f69efb9c950158e5c7e69f78e7e3973a6087a9f56ef2ecd2e8b33fa1' 
  AND token = 'GOoMmEkZQ7IDItKR45lh7GH9ey/uEBJq3qfNSqlOACg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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