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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b93b7b3a1f6e16dfe198919eceeaa7411a782827fc0557d1ee2981dc3a4b90ea' 
  AND token = '4gor58gLc0vrK1u/IDbkegkXK58dJKyBuyCwR+GdGn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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