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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8460f3d98ba41fc9e9c15f06e1ae58e0b4c6495ab337eec62dde3d6c8ef06014' 
  AND token = 'FKfasFnmQ++oRVABECJDdbmR3OQ6QCmA+5JzmWOxeO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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